/*
 * Copyright 2001-2005 (C) MetaStuff, Ltd. All Rights Reserved.
 *
 * This software is open source.
 * See the bottom of this file for the licence.
 */

package org.dom4j.datatype;

import com.sun.msv.datatype.DatabindableDatatype;
import com.sun.msv.datatype.SerializationContext;
import com.sun.msv.datatype.xsd.XSDatatype;

import org.dom4j.Element;
import org.dom4j.Namespace;
import org.dom4j.QName;
import org.dom4j.tree.AbstractAttribute;

import org.relaxng.datatype.DatatypeException;
import org.relaxng.datatype.ValidationContext;

/**
 * <p> <code>DatatypeAttribute</code> represents an Attribute which supports
 * the <a href="http://www.w3.org/TR/xmlschema-2/">XML Schema Data Types </a>
 * specification. </p>
 * 
 * @author <a href="mailto:jstrachan@apache.org">James Strachan </a>
 * @version $Revision: 1.2 $
 */
public class DatatypeAttribute extends AbstractAttribute implements
   SerializationContext, ValidationContext
{
   /** The parent <code>Element</code> of the <code>Attribute</code> */
   private Element parent;

   /** The <code>QName</code> for this element */
   private QName qname;

   /** The <code>XSDatatype</code> of the <code>Attribute</code> */
   private XSDatatype datatype;

   /** The data (Object) value of the <code>Attribute</code> */
   private Object data;

   /** The text value of the <code>Attribute</code> */
   private String text;

   public DatatypeAttribute(QName qname, XSDatatype datatype)
   {
      this.qname = qname;
      this.datatype = datatype;
   }

   public DatatypeAttribute(QName qname, XSDatatype datatype, String text)
   {
      this.qname = qname;
      this.datatype = datatype;
      this.text = text;
      this.data = convertToValue(text);
   }

   public String toString()
   {
      return getClass().getName() + hashCode() + " [Attribute: name "
         + getQualifiedName() + " value \"" + getValue() + "\" data: "
         + getData() + "]";
   }

   /**
    * Returns the MSV XSDatatype for this node
    * 
    * @return DOCUMENT ME!
    */
   public XSDatatype getXSDatatype()
   {
      return datatype;
   }

   // SerializationContext interface
   // -------------------------------------------------------------------------
   public String getNamespacePrefix(String uri)
   {
      Element parentElement = getParent();

      if(parentElement != null)
      {
         Namespace namespace = parentElement.getNamespaceForURI(uri);

         if(namespace != null)
         {
            return namespace.getPrefix();
         }
      }

      return null;
   }

   // ValidationContext interface
   // -------------------------------------------------------------------------
   public String getBaseUri()
   {
      // XXXX: could we use a Document for this?
      return null;
   }

   public boolean isNotation(String notationName)
   {
      // XXXX: no way to do this yet in dom4j so assume false
      return false;
   }

   public boolean isUnparsedEntity(String entityName)
   {
      // XXXX: no way to do this yet in dom4j so assume valid
      return true;
   }

   public String resolveNamespacePrefix(String prefix)
   {
      // first lets see if this is our attribute's prefix
      if(prefix.equals(getNamespacePrefix()))
      {
         return getNamespaceURI();
      }
      else
      {
         Element parentElement = getParent();

         if(parentElement != null)
         {
            Namespace namespace = parentElement.getNamespaceForPrefix(prefix);

            if(namespace != null)
            {
               return namespace.getURI();
            }
         }
      }

      return null;
   }

   // Attribute interface
   // -------------------------------------------------------------------------
   public QName getQName()
   {
      return qname;
   }

   public String getValue()
   {
      return text;
   }

   public void setValue(String value)
   {
      validate(value);

      this.text = value;
      this.data = convertToValue(value);
   }

   public Object getData()
   {
      return data;
   }

   public void setData(Object data)
   {
      String s = datatype.convertToLexicalValue(data, this);
      validate(s);
      this.text = s;
      this.data = data;
   }

   public Element getParent()
   {
      return parent;
   }

   public void setParent(Element parent)
   {
      this.parent = parent;
   }

   public boolean supportsParent()
   {
      return true;
   }

   public boolean isReadOnly()
   {
      return false;
   }

   // Implementation methods
   // -------------------------------------------------------------------------
   protected void validate(String txt) throws IllegalArgumentException
   {
      try
      {
         datatype.checkValid(txt, this);
      }
      catch(DatatypeException e)
      {
         throw new IllegalArgumentException(e.getMessage());
      }
   }

   protected Object convertToValue(String txt)
   {
      if(datatype instanceof DatabindableDatatype)
      {
         DatabindableDatatype bindable = (DatabindableDatatype) datatype;

         return bindable.createJavaObject(txt, this);
      }
      else
      {
         return datatype.createValue(txt, this);
      }
   }
}

/*
 * Redistribution and use of this software and associated documentation
 * ("Software"), with or without modification, are permitted provided that the
 * following conditions are met:
 * 
 * 1. Redistributions of source code must retain copyright statements and
 * notices. Redistributions must also contain a copy of this document.
 * 
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 * 
 * 3. The name "DOM4J" must not be used to endorse or promote products derived
 * from this Software without prior written permission of MetaStuff, Ltd. For
 * written permission, please contact dom4j-info@metastuff.com.
 * 
 * 4. Products derived from this Software may not be called "DOM4J" nor may
 * "DOM4J" appear in their names without prior written permission of MetaStuff,
 * Ltd. DOM4J is a registered trademark of MetaStuff, Ltd.
 * 
 * 5. Due credit should be given to the DOM4J Project - http://www.dom4j.org
 * 
 * THIS SOFTWARE IS PROVIDED BY METASTUFF, LTD. AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL METASTUFF, LTD. OR ITS CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 * 
 * Copyright 2001-2005 (C) MetaStuff, Ltd. All Rights Reserved.
 */
